MBMS Bearer Enhancements for PTT/PTX Call Latency
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE technology, face challenges in efficiently supporting Push to Talk (PTT) and Push to Everything (PTX) services through evolved MBMS (eMBMS) due to high call latency and inadequate service discovery and security enhancements, limiting the effectiveness of multicast broadcast service areas and MBSFN configurations.
Innovation Solution
The implementation of a method that allows for adaptive configuration of multicast broadcast service areas and MBSFN areas based on user demand and signal quality, utilizing pre-configured MBMS sessions and security enhancements, such as group call setup signaling and talk burst control signaling, to reduce call latency and improve service efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional unicast communication is used for PTT/PTX services, then call setup signaling can be established, but call latency becomes excessively high and service efficiency is limited
Solution Approach 1:
The patent merges unicast and multicast communication modes by establishing a unicast bearer for control signaling while using MBMS multicast bearers for data transmission. This combination allows efficient group communication with reduced call latency by avoiding individual unicast setup for each user in the group
Solution Approach 2:
The patent implements preliminary configuration of MBMS sessions and pre-establishment of multicast bearers before actual PTT/PTX communication begins. Group call setup signaling is sent in advance to prepare the multicast infrastructure, reducing call latency when actual communication starts
2Adaptability or versatility
If MBMS sessions are configured for PTT/PTX services, then service discovery is improved, but security protocols and service management complexity increase
Solution Approach 1:
The patent creates a universal MBMS session management framework that handles multiple PTT/PTX services through a common infrastructure. The same session management and security protocols serve different groups and services, reducing overall system complexity while improving service discovery
Solution Approach 2:
The patent introduces an intermediary MBMS session management layer between the core network and user equipment. This intermediary handles security protocols, session establishment, and service discovery, simplifying the interface for end users while providing robust security and management capabilities
3Area of stationary object
If multicast broadcast service areas are expanded for eMBMS services, then service coverage is improved, but network resource allocation and MBSFN configuration complexity increase
Solution Approach 1:
The patent implements dynamic MBSFN area configuration where multicast broadcast service areas are automatically adjusted based on user demand and network conditions. The system dynamically adds or removes eNBs from MBSFN areas and configures MBMS sessions as needed, expanding coverage when required while minimizing configuration complexity through automation
Data Source
AI summary
A method, an apparatus, and a computer program product for wireless communication are provided. The apparatus may be a UE that performs a PTT/PTX call setup for communication via MBMS. In a first configuration, the UE sets up a unicast bearer with an eNB, and sends group call setup signaling to the eNB while setting up the unicast bearer. In a second configuration, the UE sets up a unicast bearer with an eNB, and receives group call setup signaling from the eNB while setting up the unicast bearer. In a third configuration, the UE receives a group page while in an RRC idle state, and receives group call setup signaling based on information in the group page.